Other
Scientific paper
Jul 1970
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1970gecoa..34..771c&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 34, Issue 7, pp.771-779
Other
2
Scientific paper
Cosmogenic gamma-emitting radionuclides in the Barwell, St. Séverin and Tatlith stone meteorites were measured shortly after fall in a non-destructive gamma-gamma coincidence counting system. Comparison of the St. Séverin results with specific activities reported by other investigators on nearby samples of Stone D confirms the location of the preatmospheric surface. An initial factor-of-two buildup in the concentrations of the low-energy spallation products Na 22 , Al 26 and Mn 54 is observed at 10-20 cm depths. Activity ratios in Barwell, St. Séverin and Tatlith are compared with 9 published analyses of other freshly-fallen stone meteorites. Relying primarily on Be 10 / Al 26 activity ratios, the various specimens are arranged in order of increasing depth, samples of Granès, Harleton and St. Séverin (DII 2 ) being least shielded and Bruderheim, Tatlith and St. Séverin Stone A most shielded. In the least-shielded samples the Sc 46 / Mn 54 activity ratio is 0.34, some three times larger than expected from artificial bombardment data. All the Cr 51 / Mn 54 ratios are higher than predicted, but the ratio of 2.1 in the unshielded Granès sample is highest of all, a factor of three greater than expected. The three least-shielded samples have Co 60 / Mn 54 ratios much higher than that of any specimen except the well-shielded St. Séverin A sample. The relative enrichment in Cr 51 and Sc 46 can be explained by a low-energy solar flux, on the order of 5 nucleons/cm 2 /sec between 50 and 200 MeV. The Co 60 surface enrichment suggests a history of exposure to solar flares.
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